Many artists swear by clutch pencils (also known as drafting pencils or lead holders). Traditional wood-cased pencils change in size, weight and balance as they are sharpened, which can be a problem over time. Clutch pencils have a constant weight and size for precise technique and ease.Details:5.6 mm, grade 2B lead12 packs (6 pieces per pack)Built in sharpenerPack Contents:3 graphite leads1 lead holder1 kneaded eraser1 reusable metal case